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Soy protein adhesive and uses thereof

a technology of soy protein and adhesive composition, which is applied in the direction of protein adhesives, adhesive types, protein coatings, etc., can solve the problems of headaches of individuals sensitized to formaldehyde, minor eye and airway irritation, and particleboard free of formaldehyd

Inactive Publication Date: 2010-04-15
UNIVERSITY OF SOUTHERN MISSISSIPPI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, particleboards liberate formaldehyde during production and also over their service lives.
Although formaldehyde-based resins may be efficient and cost effective as adhesives, the toxicity and carcinogenicity of formaldehyde to humans is a serious health concern, according to the International Agency for Research on Cancer (IARC).
Individuals sensitized to formaldehyde may experience headaches and minor eye and airway irritation at levels below the odor threshold.
Low-dose acute exposure can result in headache, rhinitis, and dyspnea, while higher doses may cause severe mucous membrane irritation, burning, lachrymation, and lower respiratory effects such as bronchitis, pulmonary edema, or pneumonia.
Additionally, U.S. Pat. No. 7,081,159 is limited by solid content being restricted to <30% due to viscosity concerns.

Method used

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example method

e Hours:Minutes)

[0014]

TimeStepDetail0:001Charge reactor (reaction kettle) with water and adjust to pH 8 using ammonia.0:052Place in a water bath at 37 ± 2° C., initiate agitation at 100 RPM, and allow thetemperature to stabilize for 15 minutes.0:203Add the enzyme and increase agitation to 300 RPM.0:354Allow mixture to stir for 25 minutes.1:005Add 50% of the protein over 15 minutes.1:156Add the remaining protein slowly, taking care to ensure that it is blendedcompletely. Gradually increase stirring speed to 1200 RPM.2:007Allow the mixture to stir for an additional 90 minutes.3:308Raise the temperature to 68 ± 2° C., and charge reactor with calcium oxide andpine oil.3:359Allow the mixture to equilibrate for 30 minutes.4:0510Charge the reactor with lignin.4:1011Allow the mixture to stir for 15 minutes.4:2512Slowly charge the reactor with nitric acid until a pH of 7 is reached. Graduallyincrease agitation to 1500 RPM.4:4513Allow the mixture to stir for 15 minutes.5:0014Transfer to stora...

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Abstract

The present invention provides a soy protein-based adhesive composition and a process for making the composition that may be used in particleboards and similar wood composite systems and that is formed from an aqueous mixture of calcium oxide, pine oil, protein, lignin, and acid. The preferred protein is an enzymatically-modified soy protein and the preferred enzyme is urease.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority from U.S. Provisional Patent Application Ser. No. 61 / 100,176 filed Sep. 25, 2008. The entirety of that provisional application is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to soy protein-based adhesive compositions and a process for making such compositions that may be used in making particleboard and similar wood composite systems. The invention is further directed to particleboard and similar composite systems made with such adhesive composites. Specifically, the present invention utilizes enzymatically-modified soy proteins.BACKGROUND OF THE INVENTION[0003]Soy and other protein-based adhesives have been used in composite wood systems prior to the advent of synthetic resins such as urea formaldehyde-based resins. The synthetic resins became popular as they offered better moisture resistance and lower press times. The demand for natural, environmentally-frie...

Claims

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Application Information

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IPC IPC(8): C09J189/00C09J197/00
CPCC12Q1/6883C12Q2600/156C12Q2600/106
Inventor THAMES, SHELBY F.RAWLINS, JAMES W.FERGUSON, RICHARD C.MENDON, SHARATHKUMAR K.
Owner UNIVERSITY OF SOUTHERN MISSISSIPPI
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