Blood glues

Blood glues with permanently boil-proof and mold-resistant bonds. (Both hot- and cold-setting formulations would be desirable.)... 

The active ingredient in blood glues is albumen. It is a protein with a molecular weight of about 69,000 (9). In the adhesives industry, the physical characteristics of the blood, such as solubility and viscosity in solution, are more generally used to characterize it than are more fundamental chemical traits. The suitability of blood for adhesives is generally determined on a supplier-by-supplier and lot-by-lot basis. 

The water content of the high-blood-glue formulation is much larger, which offsets most of the material eost inerease. This is possible because the water... 

Table 8 Blood Glue Ingredients and Mixing Procedure...

As a point of interest, blood glues are not affected by many of the protein denatur-ants used to improve the performance of soybean glues specifically, sulfur compounds and complexing salts [49]. However, they are very sensitive to aldehyde-acting compounds, and... 

With respect to application methods, blood glues can be spread on wood surfaces by most conventional means. These include roller, knife, and extrusion but do not include curtain coating or spray, for which the glues must be thinned below practical film retention levels. The major advantage of alkaline-dispersed blood glues over all other wood glues except resorcinol-based synthetic resin adhesives is their sensitivity to heat, resulting in extremely... 

Table 14 Blood Glue Hot-Pressing Schedule for Interior Douglas Fir Plywood...

Synthetic rubber soya, blood glue, casein, cellulose... 

Vegetable and animal glues have been used as adhesives since the beginning ofhistory. They supply agood bond under dry conditions, but fail if the joints become damp. Moreover, they can only be used on certain materials such as wood and paper. The advent of casein and blood glues was an improvement, butthese protein materials are not resistanttoeitherwater or fungal attack.1 1... 

Lambuth, Alan, Blood Glues, in Handbook of Adhesives, 2nd Edition, I. Skeist, ed.. Chapter 11, p. 181, New York, Van Nostrand Reinhold Co., 1977. 

Blood glues are another example of hot glues. In this case, however, they are applied at ambient temperature and are converted to an infusible solid (actually an insoluble protein structure) by the application of heat. 

Norman de Bruyne (q.v.) commented [8] in the late 1980s that in the early 1930s, blood glues were state-of-the-art for plywood applications and quoted then-use in preparing laminated wood structures for the Snark, his first aircraft designed and built in 1932-1934 he also used casein-based assembly glues in the plane s construction. 

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