Glues casein

Carul-, canil-. cerul-. caseinartig, a. like casein, caseous. Casein-farbstoff, m. casein paint, -kitt, m. casein cement. -leim, m. casein glue. -Idsung, /. casein solution, -natrium, n. sodium caseinate. 

Kase-lab, n. rennet, -leim, m. casein glue, k sen, v.i. curd, curdle. 

At the same time, natural adhesives such as casein glues, animal glue and polysaccharide gums have gradually been replaced by synthetic adhesives vinyl thermoplastic adhesives [poly(vinyl acetate)], adhesives obtained by reticulation in situ of two components (as epoxy resins), represent very important materials in this field. 

Animal (Colla) Impure gelatinous mattet of animal origin, most commonly bone glue made from hides and bones, casein glue made from skimmed milk, and fish glue made from fish skins [Hackh s... 

In addition to the above, there are emulsion and suspension stabilizers that act as protective colloids and in some cases as thickeners gums (such as acacia and traga canth), alginates, starch and starch derivatives, casein, glue, egg albumin, methyl cellulose, hydrated Mg and Al silicates, etc Refs Same as in previous item... 

Casein glue, a wood glue, forms as a protein is denatured by a basic solution. 

From about 1930 to the present, casein glues have been used successfully for bonding high-strength softwood lumber into glued laminated beams and arches for interior or covered exterior service. Even earlier, until perhaps 1900, casein... 

Despite the many consumer and wood gluing uses mentioned here, an estimated 75% of casein production went into paper coatings until World War II (4). Casein use for adhesives reached its peak in 1973, at about 121 million dry pounds (5). Today, very little casein glue is used by household consumers, paper coaters, and plywood manufacturers. In 1986, nearly all U.S.-casein adhesive production was used by the door manufacturing industry, where the total volume was less than 10 million pounds. 

Casein glue is inferior to synthetic resins in durability and resistance to water, but it is very cheap and not detrimental to health, and is still popularly used at present. 

Results of a 2-year paint study indicate acetylated wood is a better painting surface (37) than untreated wood. UV radiation darkens unacetylated wood, but there is no change or a slight bleached effect with acetylated wood (37). In general, acetylation reduces the adhesive strength of wood (48). Adhesive strength is reduced with urea-formaldehyde resins (54, 55) and casein glues (55), but there is very little effect with resorcinol-formaldehyde resins (55). 

Ethers. Methylation. The simplest ether is the methyl ether. Reaction of wood with dimethyl sulfate and NaOH (54, 55), or methyl iodide and silver oxide (54) are two systems that have been reported. Methylation up to 15% weight gain did not affect the adhesive properties of casein glues. The mechanical properties of methylated wood are greatly reduced because of the severe reaction conditions required. 

Animal base skin, bones, leather, fish and casein glue (most important glue for bottle labelling), glutin hot-melt glue. 

Lambuth, A.L. Blood and casein glues. Coatings Technology Handbook D. Satas, A.A. Tracton, Eds. Marcel Dekker Inc. New York, 2001 pp. 519-530. 

Water-Soluble Proteins. Historically, several water-soluble plant and animal proteins have been used as adhesives, both industrially and in conservation work. Currently, only the milk-based casein products are in significant industrial use. Casein glues have also been used in conservation work, but formulations designed for high water resistance could be difficult to reverse. Plant proteins, especially those from legumes such as soybeans and peanuts, have been used industrially, some until fairly recently. Presumably at least some forms of plant protein glues would be reversible enough to be of interest to conservators. 

In his book The Technology of Adhesives [6], John Dehnonte tells us that the first commercial glue plant was founded in Holland in 1690, that casein glues appear to have been manufactured in Germany and Switzerland in the early nineteenth century, and that the first U.S. patent (number 183,024) on a casein glue was issued in 1876. He mentions that starch adhesives were used on postage stamps when they were first issued in 1840, and that the first U.S. patent (number 61,991) on a dextrin adhesive was issued in 1867. 

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