Difference between revisions of "Casein adhesive"
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== Description == | == Description == | ||
| − | A clear, viscous solution formed when [ | + | A clear, viscous solution formed when [[casein]], a milk protein, is soaked in water with an alkali ([[ammonium carbonate]], [[borax]], [[lime]], etc.). The alkali hydrolyzes the casein to make a solution that is usually stable for several weeks. Occasionally a plasticizer, such as [[glycerol]] or [[sorbitol]] and a preservative, such as [[phenol]], are added to the solution. Casein glues were used since ancient times as a water-proof adhesive. In the Renaissance period, casein was used for picture frames. [[Lime casein]] glues were first patented in the mid 19th century. They were an important commercial glue through W.W.I for applications such as furniture, plywood, and airplanes because they were more moisture resistant than animal glues. Casein glues were mostly replaced by [[phenolic resin|phenolic]], [[resorcinol]], and [[urea formaldehyde resin|urea formaldehyde]] adhesives in the 1930s and 40s. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 13:44, 12 January 2014
Description
A clear, viscous solution formed when Casein, a milk protein, is soaked in water with an alkali (Ammonium carbonate, Borax, Lime, etc.). The alkali hydrolyzes the casein to make a solution that is usually stable for several weeks. Occasionally a plasticizer, such as Glycerol or Sorbitol and a preservative, such as Phenol, are added to the solution. Casein glues were used since ancient times as a water-proof adhesive. In the Renaissance period, casein was used for picture frames. Lime casein glues were first patented in the mid 19th century. They were an important commercial glue through W.W.I for applications such as furniture, plywood, and airplanes because they were more moisture resistant than animal glues. Casein glues were mostly replaced by phenolic, Resorcinol, and urea formaldehyde adhesives in the 1930s and 40s.
Synonyms and Related Terms
colle caséine (Fr.); cola de caseina (Esp.); colla di caseina (It); casein glue; ammonium casein; borax casein; lime-casein; lime casein
Other Properties
Borax casein = pH (7.0-7.8); lime-casein = pH (9.0-9.9); ammonium casein = pH (8.0-9.0).
Insoluble in water or ethanol when dry. Soluble in strong alkalis and ammonium hydroxide.
Hazards and Safety
May yellow with time. Susceptible to microbiological attack.
Additional Information
H.K.Salzberg, "Casein Glues and Adhesives" in Handbook of Adhesives, I.Skeist (ed.), Van Nostrand Reinhold, New York, 1977, p.158-171.
Authority
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
- Encyclopedia Britannica, http://www.britannica.com Comment: "adhesive" Encyclopædia Britannica [Accessed February 12, 2002].
- The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: "Adhesives"
- Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000