Rigid polyurethane foam and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10604615-B2
Application number	US-201515529040-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 25, 2014
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A rigid polyurethane foam which is a polymerization product of a composition including a concentrated acid hydrolytic lignin, a polyol, and an isocyanate, and a method of preparing the rigid polyurethane foam.

First claim

The invention claimed is:

1. A rigid polyurethane foam which is a polymerization product of a composition comprising a concentrated acid hydrolytic lignin powder having a pH of 4-7, a polyol, and an isocyanate,
wherein the concentrated acid hydrolytic lignin is a lignin separated from a hydrolysate obtained by hydrolysis of lignocellulosic biomass with a concentrated acid,
wherein an amount of the concentrated acid hydrolytic lignin is 1 wt % to 40 wt % based on a total weight of a mixture of the polyol and the concentrated acid hydrolytic lignin.

2. The rigid polyurethane foam of claim 1 , wherein the concentrated acid is selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, and a Lewis acid.

3. The rigid polyurethane foam of claim 1 , wherein an amount of the concentrated acid hydrolytic lignin is 10 wt % to 30 wt % based on a total weight of a mixture of the polyol and the concentrated acid hydrolytic lignin.

4. The rigid polyurethane foam of claim 1 , wherein a hydroxyl value of the concentrated acid hydrolytic lignin is from 300 mg KOH/g to 500 mg KOH/g.

5. An article comprising the rigid polyurethane foam according to claim 1 .

6. A method of preparing a rigid polyurethane foam of claim 1 , the method comprising reacting concentrated acid hydrolytic lignin powder having pH of 4-7, a polyol, and an isocyanate in the presence of a foam stabilizing agent, a catalyst, and a foaming agent,
wherein concentrated acid hydrolytic lignin is a lignin separated from a hydrolysate obtained by hydrolysis of lignocellulosic biomass with a concentrated acid,
wherein an amount of the concentrated acid hydrolytic lignin is 1 wt % to 40 wt % based on a total weight of a mixture of the polyol and the concentrated acid hydrolytic lignin.

7. The method of claim 6 , wherein the reacting of the concentrated acid hydrolytic lignin powder having pH of 4-7, the polyol, and the isocyanate comprises:
preparing a premix comprising the concentrated acid hydrolytic lignin powder having pH of 4-7, the polyol, the foam stabilizing agent, the catalyst, and the foaming agent; and
reacting the premix with the isocyanate.

8. The method of claim 6 , further comprising, prior to the preparing of the premix, mixing the concentrated acid hydrolytic lignin powder having pH of 4-7 and the polyol to prepare a mixture.

9. The method of claim 8 , wherein the mixing of the concentrated acid hydrolytic lignin powder having pH of 4-7 and the polyol is performed at a temperature of 50° C. to 85° C. for 0.5 hours to 2 hours.

10. The method of claim 8 , wherein an amount of the concentrated acid hydrolytic lignin powder having pH of 4-7 is 1 wt % to 40 wt % based on a total weight of the mixture of the polyol and the concentrated acid hydrolytic lignin powder having pH of 4-7.

11. An article comprising the rigid polyurethane foam according to claim 2 .

12. An article comprising the rigid polyurethane foam according to claim 3 .

13. An article comprising the rigid polyurethane foam according to claim 4 .

Assignees

• Cj Cheiljedang Corp

Inventors

• Moon Sun Joo
• Kim Da Eun
• Park Jeung Yil
• Lee Sang Mok
• Jung Min Ho
• Kim Young Ran
• Kim Jung Min
• Chang Jin Hwa

Classifications

• C08J2201/022

  premixing or pre-blending a part of the components of a foamable composition, e.g. premixing the polyol with the blowing agent, surfactant and catalyst and only adding the isocyanate at the time of foaming · CPC title

• C08G18/4825

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08G18/14

  Manufacture of cellular products · CPC title

• C08G18/244

  tin salts of carboxylic acids · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title