Wood adhesives for producing particle boards

Patent metadata

Field	Value
Publication number	US-10316224-B2
Application number	US-201415027950-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Oct 7, 2013
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A composition based on phenolic resin comprising at least one phenolic resin, a vegetable protein hydrolysate, preferentially a wheat gluten hydrolysate, and an agent for accelerating curing, and also to the process for the production thereof.

First claim

The invention claimed is:

1. A composition based on phenolic resin, characterized in that it comprises at least one phenolic resin, a wheat gluten hydrolysate, and an agent for accelerating curing selected from triacetin, butyrolactone, caprolactone and propylene carbonate; wherein the phenolic resin is a product of resinous reaction of a phenol with an aldehyde and wherein the phenol:aldehyde mole ratio is from 1:1.5 to 1:1.7.

2. The composition as claimed in claim 1 , characterized in that the phenol and the wheat gluten hydrolysate are mixed in a phenol:wheat gluten hydrolysate ratio of 3.2:1 to 7.2:1 by weight.

3. The composition as claimed in claim 1 , characterized in that the content of agent for accelerating curing is between 4% and 10% by weight of the resin solids.

4. The composition as claimed in claim 1 , characterized in that the wheat gluten hydrolysate is obtained by acid or enzymatic hydrolysis.

5. The composition as claimed in claim 1 , characterized in that the wheat gluten hydrolysate is obtained by enzymatic hydrolysis and has an average molecular weight of between 3 and 20 kDa.

6. The composition as claimed in claim 1 , characterized in that the wheat gluten hydrolysate is also deamidated.

7. A process for the formation of a composition based on phenolic resin, said phenolic resin being a product of resinous reaction of a phenol with an aldehyde, characterized in that the process comprises the following steps:
mixing phenol and a wheat gluten hydrolysate, in the presence of a base solution and of a molar excess of 10% of formaldehyde in a mixer;
heating the mixture obtained to a temperature of between 90 and 98° C. and maintaining it at this temperature for approximately 15 minutes up to one hour;
adding an additional amount of formaldehyde so as to achieve a phenol:formaldehyde ratio of 1:1.5 to 1:1.7;
continuing the reaction until a resin with a viscosity of between 0.5 and 0.8 Pa·s at 25° C. is obtained;
mixing the resin obtained with an agent for accelerating curing selected from triacetin, butyrolactone, caprolactone and propylene carbonate.

8. A rigid phenolic foam board comprising a composition as claimed in claim 1 .

9. A particle or fiber board comprising a composition as claimed in claim 1 .

10. The composition as claimed in claim 3 , characterized in that the content of agent for accelerating curing is between 6% and 8% by weight of the resin solids.

11. The composition as claimed in claim 5 , characterized in that the wheat gluten hydrolysate is obtained by enzymatic hydrolysis and has an average molecular weight of between 4 and 15 kDa.

Assignees

• Syral Belgium Nv
• Univ De Lorraine
• Tereos Starch And Sweeteners Belgium

Inventors

• Pizzi Antonio
• Lagel Marie-Christine
• Redl Andreas

Classifications

• C08J2361/10

  Phenol-formaldehyde condensates · CPC title

• B27N3/02

  from particles · CPC title

• B27N3/002

  characterised by the type of binder (compositions of macromolecular compounds C08L) · CPC title

• C09J189/00

  Adhesives based on proteins; Adhesives based on derivatives thereof · CPC title

• C08L61/06

  of aldehydes with phenols · CPC title