Bookbinding hot melt adhesive

Epoxy resin and hardener crystals are mainly composed of epoxy resin and curing agent. During the storage, transportation and use, a large amount of bubbles will be generated. Although the defoamer in the material will play a great role, but For some reason: such as

1. A lot of solvent volatilizes in the material and brings out a lot of air bubbles.
2. The viscosity is large and the bubble is not released.
3. The temperature is low, so that the viscosity of the resin and the curing agent is greatly increased, and the air bubbles are difficult to release.
4. The curing process is too fast to release air bubbles.
5. The casting body is complex and the solidified material is too thick. Bubbles cannot escape from the cavity and the material, etc.

For the above reasons, we can deal with our own needs as follows:

1. Use solvent-free crystal glue as much as possible to eliminate the use of physically added solvent products, especially some things that add inorganic solvents, and resolutely not add poisonous and harmful products such as benzene, acetone, and alcohol to reduce costs. Fundamentally eliminate the generation of air bubbles.
2. Under the conditions of the construction promise, choose low-viscosity crystal glue as much as possible. Of course, processing on non-planar body can only be another matter. It can only adopt other methods, such as vacuum, etc. If it is processed on the plane. And the material poured is not particularly thick, it does not necessarily have to vacuum, just use the hot air blowing hair dryer, within one hour after the material is poured, (refer to room temperature) blow the bubble generated after casting, also You can use the needle to get rid of bubbles. Then use a hair dryer to blow the pouring body flat.
3. The temperature is low and the material viscosity is large. Especially in winter, bubbles are less likely to be discharged. To solve this problem, the resin and curing agent can be separately heated in different containers when using the crystal glue. The resin can be added to 80 degrees to 100 degrees or more. Curing agent can be added to 50 degrees to below 80 degrees, which will greatly reduce the viscosity of the material. Bubbles are released.. However, it must be noted that the material must be warmed to 30 degrees. The following can be mixed with the resin and curing agent, otherwise it will make the room temperature solidified material phase change into heating and curing, causing rapid curing, wasting material, of course, a single heating resin or curing agent. But all need to be cooled. After the principle of mixing.