Zhejiang bone glue

Properties of bone glue
The main component of bone glue is gelatin skin protein. Bone glue is a brittle hard solid. Collagen is a water-insoluble protein. After heating and other treatments, it turns into another form of protein called collagen, which is soluble in hot water and has adhesive properties.
The adhesive film of bone glue is very strong and elastic after it is formed. However, bone glue is not water-resistant. When exposed to water, the glue layer will expand and lose its bonding strength. Its corrosion resistance is also poor. Excessive temperature and humidity will cause changes.
The adhesive film of bone glue is very strong and elastic after it is formed. However, bone glue is not water-resistant. When exposed to water, the glue layer will expand and lose its bonding strength. Its corrosion resistance is also poor. Excessive temperature and humidity will cause changes.
Uses of bone glue
As an adhesive, used for bonding pencils, emery cloth, sandpaper, etc., gluing wood, binding books, etc.
Used for printing plate making and metal nameplate and badge manufacturing. Add dichromate to the bone glue solution, apply it on the metal surface and then dry it. After exposure, an insoluble thin layer can be formed. The covered and unexposed parts can still be dissolved in water and washed away, so that it can be used Etching makes printing plates and other products. Can also be used for screen printing.
Used as electroplating additive. Adding a small amount of bone glue to the plating solution can make the surface of the coating bright. /Picture
Can be used as a sizing agent in the paper and textile industries. After the straw hat is applied with bone glue and then treated with formaldehyde, it is not easy to deform and is waterproof.
Can be used as coagulant. Bone glue is a kind of animal glue, which is a chain-like natural polymer substance. The main component is protein. Its molecular weight is between ~ and can be dissolved in water. When added to water, it mainly relies on adsorption and bridging to promote the aggregation of destabilized colloidal particles. The use of bone glue in combination with aluminum salt or iron salt can achieve good coagulation effects. my country's Nanjing Water Supply Company used bone glue as a coagulant aid in combination with ferric chloride for the first time in 2006, and achieved good treatment effects.
How to use bone glue
When using bone glue, there is no need to add any auxiliary materials. You only need to soak the bone glue in an equal or slightly larger volume of water (preferably hot water) for about an hour to make the glue block Become soft, and then heat it to about ℃ to turn it into a glue liquid and then use it. The ratio of glue to water should be determined according to the required viscosity. If there is more water, the viscosity will be low and thin, and if there is less water, the viscosity will be high and thick. The glue temperature should not be too high when hot gluing. If the temperature exceeds ℃, the viscosity will decrease due to molecular degradation and the glue will age and deteriorate. Bone glue will precipitate slightly during use, so it is necessary to add water and stir as necessary to adjust the viscosity and fluidity. The bath heating method must be used when hot glue is used, and the container for storing glue must never be heated directly.
Bone glue must be kept at a certain temperature before it can be used. Therefore, when water needs to be added during use, the temperature of the added water and the colloid should be basically the same, and cold water cannot be added. Because bone glue needs to maintain a certain temperature (℃℃), the temperature of the glue will drop sharply after adding cold water, which will cause the glue to become lumpy, which will affect the bonding effect. When using bone glue, the glue should be applied quickly and evenly. Do not dip too much glue at one time to cause uneven glue layer. , Penetrating joints, glue leakage and other problems./Picture