What is polyurethane adhesive?
Polyurethane adhesive is a type of adhesive used to bind to a book and wood processing. Polyurethane is a class of polymers that are formed from the chain of organic units associated with urethan bonds. A wide range of polyurethane adhesive products is available. Different chemical combinations result in different properties. The chemical composition can be alerted to produce different levels of stiffness, density and hardness.
The main advantage of polyurethane adhesive is that it is water resistant. This property makes it glue for book binders and book repair companies. The adhesive has a very low level of viscosity, heals in seconds and has a fraudulent condition in room temperature conditions. When using adhesives, the treatment time required before the adhesive connects both items together.
as glue, polyurethane was first developed in 1985. The first version had very specific features. The adhesive was made available in 1988 and had a high viscineOzit, low initial strength level, but had a three -day waiting time before he cured.
In 1996, a second generation of polyurethane adhesive was developed. The treatment time was shortened to less than three days, while maintaining a low level of starting strength and high viscosity. Further work was carried out to reduce the treatment period while maintaining functions that make the adhesive useful.
Another significant improvement occurred in 2000. At this stage, the treatment time was shortened to a maximum of 16 hours and at least six hours. The strength was improved and the viscosity has decreased to make it more commercial.
The fourth generation was made available in 2007. In this version, the viscosity is much lower, the strength remains the same as in 2000, but the treatment time is only a few seconds. This change is essential for commercial success and prolonged usefulness of the product.
in North America with polyurethane adhesive pHe is born under the Gorilla Glue ™ or Excel ™. The sale of polyurethane adhesive has expanded outside the specialized industry binding industry. These products can now be found in any hardware store for general consumer use.