Bone glue is one of the most widely used animal adhesive materials. Its characteristics are: good bonding performance, high strength, low moisture, fast drying, good bonding and shaping, and low price, easy to use, especially suitable for bonding and pasting hardcover book shell, can get good results.
Gumming performance
The main component of animal glue is gelatin skin protein. A low-purity grade of bone glue is called bone glue. Bone gum is a brittle hard block solidified body. Collagen is a protein that is insoluble in water. After being heated and treated, it becomes another form of protein called gelatin, which is soluble in hot water and has adhesive properties. The plastic film of bone glue is very firm and elastic after forming: But the glue is not water resistant, and the water will make the adhesive layer expand and lose the adhesive strength: its corrosion resistance is also poor, and the temperature is too high and the humidity is too large can cause changes.
Gummy use
1 Used for adhesive bonding of bone glue, used for bonding of pencils, emery cloths, sandpaper, etc., glued wooden devices, binding books, etc.
2 Used for printing plates and metal nameplates and badges. The dichromate is added to the bone glue solution, dried on the metal surface, dried to form an insoluble thin layer after exposure, and the exposed part is still soluble in water and washed off, so that it can be used. Etched into printed products and other products. Can also be used for screen printing.
3 used as a plating additive. Adding a small amount of bone glue in the plating solution will make the surface of the coating bright.
4 can be used as sizing agent for paper and textile industries. After applying plastic glue on the straw cap, it is treated with formaldehyde and is not easily deformed and waterproof.
Production Process
The aggregate is crushed to an average size of 1 to 8 cm in size, and the bone oil is extracted with an organic solvent such as benzene and petroleum ether, so that the fat content in the aggregate is reduced to less than 1%, typically about 0.3 to 0.5%. Then, the aggregates are rubbed against each other in a rotating drum to separate the remaining meat and ribs on the surface. Then put into the bleaching tank, add water and introduce sulfur dioxide gas. Sulfur dioxide dissolves in water and produces sulfite, which has the effect of sterilization and acid treatment in addition to bleaching. Sulfur dioxide converts part of the calcium phosphate in the aggregate into calcium dihydrogen phosphate and dissolves in water. This allows osteoporosis and facilitates extraction with water. This process is commonly known as smoked bone in some manufacturing enterprises. Sulfur dioxide treatment and washing are immediately sent to extraction. The extraction is carried out at a pressure of about 0.25 MPa, so the temperature is higher. The extractor is usually a group of 6-8, and the extract is periodically reversed by the tank. The most concentrated extract was withdrawn from the newly loaded extractor. The extract was filtered and evaporated to about 50%. After adding an appropriate preservative, it is cooled to form a gel and dried to become bone glue.